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Patterns of deoxyribonucleic acid (DNA) metabolism in nonpermissive cells infected with amber mutants representing 29 genes of T5 are reported. A group of 7 contiguous genes are essential for the synthesis of phage DNA, whereas 20 other genes, when defective, permit varying degrees of phage DNA synthesis. Two further genes are essential for complete transfer of phage DNA to host cells, and therefore indirectly do not permit the synthesis of phage DNA. The structural genes for an early T5 deoxyribonuclease and for T5 DNA polymerase, as well as a gene that affects the synthesis of dihydrofolate reductase, have been identified in the genetic map of T5.

journal of virology

Genetic and Physiological Studies of Bacteriophage T5 III. Patterns of Deoxyribonucleic Acid Synthesis Induced by Mutants of T5 and the Identification of Genes Influencing the Appearance of Phage-Induced Dihydrofolate Reductase and Deoxyribonuclease